Why Europeans started trade routes to the east by sea and the navigational instruments they used.
At the beginning of the 15th century, Europeans had limited geographical knowledge.
They were very familiar with all of Europe and the territories around the Mediterranean and Black Seas. They also knew about India, China and Japan because travellers and merchants like Marco Polo brought silk, spices and other products back from Asia.
But Europeans knew very little about most of Africa. They did not know that America, Oceania and Antarctica even existed.
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Marco Polo was a Venetian merchant. In 1271 he initiated a journey following the Silk Road that took him to the court of Kublai Khan, the last ruler of the Mongol Empire, in China. When he returned, he told all of his stories to a friend, who wrote them down and later published them in a book called The travels of Marco Polo.
He described the incredible journeys and life in the Far East. This work fascinated others and made them more interested in learning about those distant lands.